Safest Drinking Water in Wisconsin 2026
Wisconsin has 5 public water systems serving 1,209,687 people. The safest system is Kenosha Water Utility in Kenosha with a score of 100/100.
Top 5 Water Systems in Wisconsin
| # | Water System | City | Pop. Served | Source | Violations | Score |
|---|---|---|---|---|---|---|
| 1 | Kenosha Water Utility | Kenosha | 99,218 | Surface water | 0 | A (100) |
| 2 | Milwaukee Waterworks | Milwaukee | 626,000 | Surface water | 0 | A (97) |
| 3 | Racine Waterworks | Racine | 105,100 | Surface water | 0 | A (97) |
| 4 | Madison Water Utility | Madison | 272,000 | Ground water | 1 | B (87) |
| 5 | Green Bay Waterworks | Green Bay | 107,369 | Surface water | 0 | B (80) |
Water quality data for Wisconsin is sourced from the EPA Safe Drinking Water Information System (SDWIS), which tracks compliance for all public water systems.
Frequently Asked Questions
Kenosha Water Utility in Kenosha has the highest Water Safety Score in Wisconsin at 100/100 (Grade A), serving 99,218 people.
Wisconsin has 5 public water systems serving 1,209,687 people. The average Water Safety Score is 92/100.
The Water Safety Score (0-100) is based on health violations (40%), contaminant exceedances (30%), enforcement history (20%), and monitoring violations (10%). Higher scores mean cleaner, safer water.
Water Safety Score: health violations (40%), contaminant exceedances (30%), enforcement history (20%), monitoring violations (10%).